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为提高带通滤波器的选择特性,文章基于逆开口谐振环(CSRR)的构造思路,首先提出一种菱形逆开口谐振环(DSCSRR),并对其左手特性加以证明;然后详细研究了改变其结构参数对DSCSRR传输特性的影响程度;最后设计了一款基于DSCSRR带通滤波器并对所设计的滤波器进行了实物加工和实验测量,测量结果与仿真结果表明,所设计滤波器的中心频率为4.02GHz,选择特性为170dB/GHz,带内抑制小于15dB。该新型滤波器不仅具有选择特性高,而且具有体积小、设计简单等优点。
In order to improve the selection characteristics of the band-pass filter, based on the construction idea of the inverse open-loop resonant ring (CSRR), a diamond reverse-opening resonant ring (DSCSRR) is first proposed and its left-handed characteristics are proved. Then, Structure parameters on the DSCSRR transmission characteristics of the degree; Finally, a design based on DSCSRR band-pass filter and the designed filter processing and experimental measurements, the measurement results and simulation results show that the design of the filter center frequency Is 4.02GHz, the selected characteristic is 170dB / GHz, in-band rejection is less than 15dB. The new filter not only has the characteristics of high selection, but also has the advantages of small size, simple design.